Indian River Research and Education Center , University of Florida , 2199 South Rock Road , Fort Pierce , Florida 34945 , United States.
Citrus Research and Education Center , University of Florida , 700 Experiment Road , Lake Alfred , Florida 33850 , United States.
J Agric Food Chem. 2018 Jul 5;66(26):6604-6608. doi: 10.1021/acs.jafc.7b02526. Epub 2017 Sep 5.
Copper (Cu) bactericides/fungicides are used extensively for crop protection in agriculture. Concerns for Cu accumulation in soil, Cu leaching into the surrounding ecosystem, and development of Cu resistance in phytopathogenic bacteria are evident. While there is no suitable alternative to Cu available to date for agricultural uses, it is possible to reduce Cu per application by supplementing with Zn and improving Cu bioavailability using nanotechnology. We have prepared a non-phytotoxic composite material consisting of generally recognized as safe ZnO 800 particles and nanocopper-loaded silica gel (ZnO-nCuSi). The morphology of the ZnO-nCuSi material was characterized using scanning electron microscopy, showing ZnO particles dispersed in the silica gel matrix. ZnO-nCuSi demonstrated strong in vitro antimicrobial properties against several model plant bacterial species. Two consecutive year field efficacy results showed that agri-grade ZnO-nCuSi was effective in controlling citrus canker disease at less than half the metallic rate of the commercial cuprous oxide/zinc oxide pesticide.
铜（Cu）杀菌剂/杀真菌剂在农业中被广泛用于作物保护。人们对土壤中 Cu 的积累、Cu 浸出到周围生态系统以及植物病原菌对 Cu 的抗性的发展表示关注。虽然目前尚无适用于农业用途的 Cu 替代品，但通过补充 Zn 并利用纳米技术提高 Cu 的生物利用度，可以减少每次应用的 Cu 用量。我们已经制备了一种由普遍认为安全的 ZnO 800 颗粒和负载纳米铜的硅胶（ZnO-nCuSi）组成的非植物毒性复合材料。使用扫描电子显微镜对 ZnO-nCuSi 材料的形态进行了表征，结果表明 ZnO 颗粒分散在硅胶基质中。ZnO-nCuSi 对几种模式植物细菌表现出很强的体外抗菌性能。连续两年的田间药效结果表明，农用级 ZnO-nCuSi 以低于商业氧化亚铜/氧化锌农药金属用量一半的用量有效控制了柑橘溃疡病。
